山洪冲击角度对路基冲击力分布规律影响的试验研究  

Experimental Study on Influence of Impact Angle of Mountain Torrent on Distribution Rule of Impact Force on Subgrade

作　　者：王贺[1] 陈洪凯[1] 张金浩[1] 王群 WANG He;CHEN Hongkai;ZHANG Jinhao;WANG Qun(Institute of Geotechnical Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2020年第5期97-102,共6页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：2016年重庆高校创新团队建设计划资助项目(CXTDG201602012)。

摘　　要：为了研究山洪流体以不同冲击角度θ冲击路基时路基的受力分布状态,开展了室内模型试验。在试验路基面板上14个测点布设了动态应变系统及高清摄像仪,选择5个冲击角度θ=15°、30°、45°、60°和70°模拟山洪冲击;分析了路基受山洪冲击作用的冲击力-时程(F-t)曲线;结合高清摄像仪纪录的视频资料,研究了山洪冲击角度θ对路基所受冲击力F分布的影响规律。结果表明:以5个不同冲击角度冲击路基的山洪,在流经流通区弯道处,均有明显的超高,且路基上部及右部测点出现了阵流现象;当冲击角度θ=15°时,山洪冲击力最大,山洪最先冲击路基下部的测点9,最后冲击右上部的测点13;无论哪个冲击角度,山洪最大冲击力Fmax均出现在靠近沟口的路基下侧处,且有Fmax,15°>Fmax,45°>Fmax,30°>Fmax,75°>Fmax,60°;山洪冲击角度θ对路基平均冲击力Fm的分布有着很大的影响,且有Fm,15°>Fm,30°>Fm,75°>Fm,45°>Fm,60°。In order to study the distribution of impact force on subgrade F under the impact of mountain torrent with different impact angle θ,the indoor model test was carried out.Firstly,the dynamic strain system and high-definition camera were set up on the fourteen measuring points on the tested subgrade panel,and five impact angles which were 15°,30°,45°,60°and 70°were selected to simulate the mountain torrent impact.Secondly,the impact force-time history(F-t)curve of subgrade under the impact of mountain torrent was analyzed.Finally,combining with the video data recorded by highdefinition camera,the influence rule of the impact angleθof mountain torrent on the distribution of the impact force on subgrade F was studied.The results show that:the mountain torrents that impact the subgrade with five different impact angles all have obvious superelevation at the bend of the flow area,and there are array flow phenomena at the upper and right measuring points of subgrade.When the impact angleθis 15°,the mountain torrent impact force is the largest,and the measuring point No.9 at the lower part of the subgrade is firstly impacted by mountain torrent,while the measuring point No.13 at the upper right part is the last to suffer from mountain torrent impact.Regardless of the impact angle,the maximum impact force on subgrade Fmaxappears at the lower side of the subgrade near the gully,and the order is Fmax,15°>Fmax,45°>Fmax,30°>Fmax,75°>Fmax,60°.And the impact angleθof mountain torrent has a great influence on the distribution of the average impact force on subgrade Fm,and the order is Fm,15°>Fm,30°>Fm,75°>Fm,45°>Fm,60°.

关 键 词：道路工程 山洪 冲击角度 冲击力分布 公路路基 

分 类 号：U41[交通运输工程—道路与铁道工程] P642.2[天文地球—工程地质学]